TY - JOUR
T1 - Entrapped elemental selenium nanoparticles affect physicochemical properties of selenium fed activated sludge
AU - Jain, Rohan
AU - Seder-Colomina, Marina
AU - Jordan, Norbert
AU - Dessi, Paolo
AU - Cosmidis, Julie
AU - van Hullebusch, Eric D.
AU - Weiss, Stephan
AU - Farges, François
AU - Lens, Piet N.L.
N1 - Publisher Copyright:
© 2015 Elsevier B.V..
PY - 2015/9/5
Y1 - 2015/9/5
N2 - Selenite containing wastewaters can be treated in activated sludge systems, where the total selenium is removed from the wastewater by the formation of elemental selenium nanoparticles, which are trapped in the biomass. No studies have been carried out so far on the characterization of selenium fed activated sludge flocs, which is important for the development of this novel selenium removal process. This study showed that more than 94% of the trapped selenium in activated sludge flocs is in the form of elemental selenium, both as amorphous/monoclinic selenium nanospheres and trigonal selenium nanorods. The entrapment of the elemental selenium nanoparticles in the selenium fed activated sludge flocs leads to faster settling rates, higher hydrophilicity and poorer dewaterability compared to the control activated sludge (i.e., not fed with selenite). The selenium fed activated sludge showed a less negative surface charge density as compared to the control activated sludge. The presence of trapped elemental selenium nanoparticles further affected the spatial distribution of Al and Mg in the activated sludge flocs. This study demonstrated that the formation and subsequent trapping of elemental selenium nanoparticles in the activated sludge flocs affects their physicochemical properties.
AB - Selenite containing wastewaters can be treated in activated sludge systems, where the total selenium is removed from the wastewater by the formation of elemental selenium nanoparticles, which are trapped in the biomass. No studies have been carried out so far on the characterization of selenium fed activated sludge flocs, which is important for the development of this novel selenium removal process. This study showed that more than 94% of the trapped selenium in activated sludge flocs is in the form of elemental selenium, both as amorphous/monoclinic selenium nanospheres and trigonal selenium nanorods. The entrapment of the elemental selenium nanoparticles in the selenium fed activated sludge flocs leads to faster settling rates, higher hydrophilicity and poorer dewaterability compared to the control activated sludge (i.e., not fed with selenite). The selenium fed activated sludge showed a less negative surface charge density as compared to the control activated sludge. The presence of trapped elemental selenium nanoparticles further affected the spatial distribution of Al and Mg in the activated sludge flocs. This study demonstrated that the formation and subsequent trapping of elemental selenium nanoparticles in the activated sludge flocs affects their physicochemical properties.
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U2 - 10.1016/j.jhazmat.2015.03.043
DO - 10.1016/j.jhazmat.2015.03.043
M3 - Article
C2 - 25919502
AN - SCOPUS:84928339123
SN - 0304-3894
VL - 295
SP - 193
EP - 200
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -